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- Sleep - Wikipedia
Sleep is a state of reduced mental and physical activity in which consciousness is altered and certain sensory activity is inhibited During sleep, there is a marked decrease in muscle activity and interactions with the surrounding environment
- About Sleep | Sleep | CDC
Quality sleep means you are getting uninterrupted and refreshing sleep Getting quality sleep is not just about how many hours you sleep, but how well you sleep
- Why Is Sleep Important? Benefits of Healthy Sleep
Sleep is more than "lights out" time Learn what happens when you sleep and why sleep is important for your mental and physical health
- The Science of Sleep: Understanding What Happens When You Sleep
What exactly does sleep do for your body and mind? Here’s what researchers know about the science of sleep—including the stages of sleep, your biological clock, health connections and more
- Science of Sleep: What is Sleep? | Sleep Medicine
Fifty years of research on brain activity and physiological patterns of sleeping has revealed a great deal about what sleep is and what it is not We all have at least a vague notion of what sleep is, but that doesn't mean that defining this mysterious part of our lives is simple
- Stages of Sleep: What Happens in a Normal Sleep Cycle?
There are four phases of sleep, including one for rapid eye movement (REM) sleep and three that form non-REM (NREM) sleep These stages are determined based on an analysis of brain activity during sleep, which shows distinct patterns that characterize each stage
- Sleep | Definition, Patterns, Deprivation, Theories | Britannica
Sleep usually requires the presence of relaxed skeletal muscles and the absence of the overt goal-directed behaviour of which the waking organism is capable The characteristic posture associated with sleep in humans and in many but not all other animals is that of horizontal repose
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